2003, Brigitte Hamann, Hans Mommsen, editor, The Third Reich Between Vision and Reality: New Perspectives on German History 1918–1945, Hitler and Vienna: The Truth about his Formative Years, page 35:

The son of a former houseowner in the Stumpergasse told me that the young Hitler would go every morning to a Jewish distiller (Branntweiner) near his flat to have a small breakfast there consisting always of ‘a tea and a kipfel’.